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I have attached the demo "Checkbox Binding". We first saw this behavior in our application but I was able to reproduce the behavior in your demo application.
WinForms
.NET Core 3.1
C#
Have multiple parent nodes in a TreeViewAdv.
Each parent node has multiple children.
The Parent nodes have ShowCheckBox=false
The Child nodes have ShowCheckBox=true
Click the first child under a parent node.
Expected: That child's checkbox is checked
Actual: All the children under that parent get checkboxes checked.